振动态H2^+在抽运探测激光驱动下对谐波辐射强度的影响  

Effect on harmonic intensity from vibrating H2+ driven by pump-probe laser field

作　　者：李义[1] 冯立强[1,2] LI Yi;FENG Li-Qiang(College of Science,Liaoning University of Technology,Jinzhou 121001,China;State Key Laboratory of Molecular Reaction Dynamics,Dalian Institute of Chemical Physics Chinese Academy of Sciences,Dalian 116023,China)

机构地区：[1]辽宁工业大学理学院,锦州121001 [2]中国科学院大连化学物理研究所分子反应动力学国家重点实验室,大连116023

出　　处：《四川大学学报（自然科学版）》2020年第3期539-543,共5页Journal of Sichuan University(Natural Science Edition)

基　　金：国家自然科学基金(11504151)。

摘　　要：理论研究振动态H2+在抽运探测激光驱动下对谐波辐射强度的影响.结果表明,在低振动态下(例如:υ=0),谐波辐射强度随抽运探测激光场延迟时间的增大而减小.随着振动态升高(例如:υ=2),不同延迟时间下的谐波辐射强度差减小.当振动态继续升高时(例如:υ=4),较大延迟时间下的谐波辐射强度反而高于较小延迟时间下的谐波辐射强度.最后,通过研究谐波辐射的时频分析图给出了谐波辐射强度变化的原因.The effect on the harmonic intensity from vibrating H+2 driven by the pump-probe laser field has been theoretically investigated. The results show that for the low vibrational state(i.e. υ= 0) case, the intensity of the harmonic spectrum is decreased as the delay time of the pump-probe pulse increases. With the increase of the vibrational state(i.e. υ= 2), the harmonic intensity differences under different delay times are decreased. When the vibrational state is further increased(i.e. υ= 4), the intensity of the harmonic spectrum under the larger delay time is higher than that of the smaller delay time case. Finally, by investigating the time-frequency analysis chart of harmonic spectrum, we reveal the physical mechanism of the harmonic intensity changes.

关 键 词：高次谐波 振动态H+2 抽运探测激光场 谐波强度 

分 类 号：O562.4[理学—原子与分子物理]